Heat Interface Units

Instantaneous pressure, temperature and flow control.

What you need to know

The correct performance of HIUs are critical to heat networks.

Key issues:

Required life expectancy 20+years

Simultaneous pressure and temperature control

DHW and Space Heating performance under dynamic conditions


HIU Options - from Standard to Bespoke

Danfoss FlatStations come in Direct and Indirect options, both of which use a Domestic Hot Water (DHW) plate heat exchanger.
Direct FlatStations, allow the primary circuit to connect directly to the apartment space heating circuits and Indirect FlatStations, enable hydraulic separation of the primary circuit through a second plate heat exchanger.

Simultaneous Pressure and Temperature Control

Maintaining a high efficiency whilst having a reliable supply of hot water is crucial.
Mechanical controls ensure both system performance and comfort for residents.

Energy Metering

All Danfoss FlatStations can be easily be equipped with an energy meter, to fulfill billing requirements and enable ongoing energy optimisation efforts.

Kamstrup 603 Meter in Hand

Gemina Termix - member of Danfoss group

Trusted technology partner

A high degree of innovation has assured Gemina Termix its position as a European market leader in HIUs.¬†Gemina Termix’s direct access to Danfoss’s state of the art heat network technologies combined with Termix’s decades long application and assembly competences makes a winning combination. The production factory is certified to the ISO/TS 16949 standard which is a technical standard for continual improvement, defect prevention and the reduction of variation originally developed by the automotive industry. The factory is also certified in accordance with ISO 9001 and ISO 14001 requirements as well as the OHSAS 18001 occupational health and safety standard.



Danfoss FlatStations installed in the UK alone

Document Downloads

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Design Guides
  • FlatStations Design & Product Guide

  • Delta T Design Guide

  • 7 Series DS-I-R-FI

  • 5 Series

  • 1 Series

  • Prepayment Valve & Actuator

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